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RISS 인기검색어
- 검색키워드
- 저자 : Nosrat Granpayeh (검색결과 7 건)
- 무료
- 기관 내 무료
- 유료
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All Optical Logic Gates Based on Two Dimensional Plasmonic Waveguides with Nanodisk Resonators
Alireza Dolatabady,Nosrat Granpayeh 한국광학회 2012 Current Optics and Photonics Vol.16 No.4
In this paper, we propose, analyze and simulate the performances of some new plasmonic logic gates in two dimensional plasmonic waveguides with nanodisk resonators, using the numerical method of finite difference time domain (FDTD). These gates, including XOR, XNOR, NAND, and NOT, can provide the highly integrated optical logic circuits. Also, by cascading and combining these basic logic gates, any logic operation can be realized. These devices can be utilized significantly in optical processing and telecommunication devices.
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Mahdieh Bozorgi,Nosrat Granpayeh 한국광학회 2011 Current Optics and Photonics Vol.15 No.2
We have designed two photonic crystal waveguide (PCW) structures with output focused beams in order to achieve more coupling between photonic devices and decrease the mismatch losses in photonic integrated circuits. PCW with coupled resonator optical waveguide (CROW) termination has been optimized by both one dimensional (1D) and seven dimensional (7D) particle swarm optimization (PSO) algorithms by evaluating the fitness function by the finite difference time domain (FDTD) method. The 1D and 7Doptimizations caused the factors of 2.79 and 3.875 improvements in intensity of the main lobe compared to the non-optimized structure, whereas the FWHM in 7D-optimized structure was increased, unlike the 1D case. It has also been shown that the increment of focusing causes decrement of the bandwidth.
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Duality of Photonic Crystal Radiative Structures and Antenna Arrays
Mahdieh Bozorgi,Nosrat Granpayeh 한국광학회 2010 Current Optics and Photonics Vol.14 No.4
In this paper, behaviors of photonic crystal (PC) radiative structures and antenna arrays have been compared for two types of uniform and binomial excitations. Appropriate duality has been shown between them. These results can be generalized to other types of excitation and arrangement of photonic crystal radiative arrays such as linear, planar and circular arrays of three dimensional (3D) photonic crystal termination resonators. Using these results in designing photonic circuits has some advantages for shaping a particular radiative beam at the photonic crystal exit, for instance reducing the divergence angle of the main lobe in order to enhance the directivity, for better coupling, or for splitting the emitted beam, for dividing the output beam to the next devices in photonic integrated circuits (PIC). For analysis and simulation of the photonic crystal structures, the finite difference time domain (FDTD) method has been employed.
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Wideband Gain Flattened Hybrid Erbium-doped Fiber Amplifier/Fiber Raman Amplifier
Hossein Afkhami,Alireza Mowla,Nosrat Granpayeh,Azadeh Rastegari Hormozi 한국광학회 2010 Current Optics and Photonics Vol.14 No.4
An optimal wideband gain flattened hybrid erbium-doped fiber amplifier/fiber Raman amplifier (EDFA/FRA) has been introduced. A new and effective optimization method called particle swarm optimization (PSO) is employed to find the optimized parameters of the EDFA/FRA. Numerous parameters which are the parameters of the erbium-doped fiber amplifier (EDFA) and the fiber Raman amplifier (FRA)define the gain spectrum of a hybrid EDFA/FRA. Here, we optimize the length, Er3+ concentration, and pump power and wavelength of the EDFA and also pump powers and wavelengths of the FRA to obtain the flattest operating gain spectrum. Hybrid EDFA/FRA with 6-pumped- and 10-pumped-FRAs have been studied. Gain spectrum variations are 1.392 and 1.043 dB for the 6-pumped- and 10-pumped-FRAs,respectively, in the 108.5 km hybrid EDFA/FRAs, with 1 mW of input signal powers. Dense wavelength division multiplexing (DWDM) system with 60 signal channels in the wavelength range of 1529.2-1627.1nm, i.e. the wide bandwidth of 98 nm, is studied. In this work, we have added FRA’s pump wavelengths to the optimization parameters to obtain better results in comparison with the results presented in our previous works.
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Analysis of a Triangular-shaped Plasmonic Metal-Insulator-Metal Bragg Grating Waveguide
Behnaz Jafarian,Najmeh Nozhat,Nosrat Granpayeh 한국광학회 2011 Current Optics and Photonics Vol.15 No.2
A novel triangular-shaped plasmonic metal-insulator-metal (MIM) Bragg grating waveguide is introduced,whose band-gap is narrower than that of the conventional step type and wider than that of the sawtoothshaped one. Moreover apodized triangular-shaped MIM Bragg grating structures are proposed in order to reduce the side lobes of the transmission spectrum, because the Bragg reflector with a sawtooth profile has a smoother transmission spectrum than that of a triangular-shaped one. The performance of the proposed structures is simulated by using the finite difference time domain method.
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Improved Plasmonic Filter, Ultra-Compact Demultiplexer, and Splitter
Aso Rahimzadegan,Seyyed Poorya Hosseini,Nosrat Granpayeh 한국광학회 2014 Current Optics and Photonics Vol.18 No.3
In this paper, metal insulator metal (MIM) plasmonic slot cavity narrow band-pass filters (NBPFs) are studied. The metal and dielectric of the structures are silver (Ag) and air, respectively. To improve the quality factor and attenuation range, two novel NBPFs based on tapered structures and double cavity systems are proposed and numerically analyzed by using the two-dimensional (2-D) finite difference time domain (FDTD) method. The impact of different parameters on the transmission spectrum is scrutinized. We have shown that increasing the cavities’ lengths increases the resonance wavelength in a linear relationship, and also increases the quality factor, and simultaneously the attenuation of the wave transmitted through the cavities. Furthermore, increasing the slope of tapers of the input and output waveguides decreases attenuation of the wave transmitted through the waveguide, but simultaneously decreases the quality factor, hence there should be a trade-off between loss and quality factor. However, the idea of adding tapers to the waveguides’ discontinuities of the simple structure helps us to improve the device total performance, such as quality factor for the single cavity and attenuation range for the double cavity. According to the proposed NBPFs, two, three, and four-port power splitters functioning at 1320 nm and novel ultra-compact two-wavelength and triple-wavelength demultiplexers in the range of 1300-1550 nm are proposed and the impacts of different parameters on their performances are numerically investigated. The idea of using tapered waveguides at the structure discontinuities facilitates the design of ultra-compact demultiplexers and splitters.
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Temperature Stabilization of Group Index in Silicon Slotted Photonic Crystal Waveguides
Hassan Aghababaeian,Mohammad-Hashem Vadjed-Samiei,Nosrat Granpayeh 한국광학회 2011 Current Optics and Photonics Vol.15 No.4
In this paper, we have proposed a principle to design wideband, low dispersion and temperature stabilized slow light structure in slotted photonic crystal waveguide (SPCW). The infiltration of the silicon photonic crystal with polymer will enhance the slow light and increase the group index, whereas the different signs of thermo-optic coefficients of polymer and silicon make the proposed structure stable on temperature variation over 60℃ and improves the group index-bandwidth products of the designed structure. The SPCW structure is modified to maximize the slow light effect and minimize the dependence of the group index and hence the group velocity dispersion to temperature.
DBpia
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